1983 Volume 56 Issue 12 Pages 3603-3607
9,10-Phenanthrenequinone monoxime has been used as a reagent for the spectrophotometric determination of ruthenium(III) and rhodium(III) after extraction into molten naphthalene. The extracted mixture of the metal complex and naphthalene was dissolved in chloroform and ruthenium and rhodium were determined spectrophotometrically. Beer’s law holds in the concentration range of 0.2–4.1 μg/cm3 for ruthenium and 0.3–5.3 μg/cm3 for rhodium in 10 cm3 of the final solution. The molar absorptivities and Sandell sensitivities are calculated to be 9.70×103 l mol−1 cm−1 and 0.01 μg/cm2 (660 nm) for ruthenium and 1.13×104 l mol−1 cm−1 and 0.009 μg/cm2 (410 nm) for rhodium respectively. Aliquots containing 2.0 μg of ruthenium and 4.1 μg of rhodium give mean absorbances of 0.192 and 0.451 with standard deviations of 0.0017 and 0.0039, respectively. Interference of various ions has been studied and the method has been applied to the determination of ruthenium and rhodium in various synthetic mixtures. This procedure is also applied to the simultaneous determination of ruthenium and rhodium present together in a solution.
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